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* [PATCH] staging: greybus: fix stack size warning with UBSAN
@ 2021-01-03 22:35 ` Arnd Bergmann
  0 siblings, 0 replies; 6+ messages in thread
From: Arnd Bergmann @ 2021-01-03 22:35 UTC (permalink / raw)
  To: Vaibhav Agarwal, Mark Greer, Johan Hovold, Alex Elder,
	Greg Kroah-Hartman, Nathan Chancellor, Nick Desaulniers
  Cc: Arnd Bergmann, Dan Carpenter, Coiby Xu, greybus-dev, devel,
	linux-kernel, clang-built-linux

From: Arnd Bergmann <arnd@arndb.de>

clang warns about excessive stack usage in this driver when
UBSAN is enabled:

drivers/staging/greybus/audio_topology.c:977:12: error: stack frame size of 1836 bytes in function 'gbaudio_tplg_create_widget' [-Werror,-Wframe-larger-than=]

Rework this code to no longer use compound literals for
initializing the structure in each case, but instead keep
the common bits in a preallocated constant array and copy
them as needed.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/staging/greybus/audio_topology.c | 106 ++++++++++-------------
 1 file changed, 47 insertions(+), 59 deletions(-)

diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
index 96b8b29fe899..c03873915c20 100644
--- a/drivers/staging/greybus/audio_topology.c
+++ b/drivers/staging/greybus/audio_topology.c
@@ -974,6 +974,44 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w,
 	return ret;
 }
 
+static const struct snd_soc_dapm_widget gbaudio_widgets[] = {
+	[snd_soc_dapm_spk]	= SND_SOC_DAPM_SPK("spk", gbcodec_event_spk),
+	[snd_soc_dapm_hp]	= SND_SOC_DAPM_HP("hp", gbcodec_event_hp),
+	[snd_soc_dapm_mic]	= SND_SOC_DAPM_MIC("mic", gbcodec_event_int_mic),
+	[snd_soc_dapm_output]	= SND_SOC_DAPM_OUTPUT("output"),
+	[snd_soc_dapm_input]	= SND_SOC_DAPM_INPUT("input"),
+	[snd_soc_dapm_switch]	= SND_SOC_DAPM_SWITCH_E("switch", SND_SOC_NOPM,
+					0, 0, NULL,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_pga]	= SND_SOC_DAPM_PGA_E("pga", SND_SOC_NOPM,
+					0, 0, NULL, 0,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_mixer]	= SND_SOC_DAPM_MIXER_E("mixer", SND_SOC_NOPM,
+					0, 0, NULL, 0,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_mux]	= SND_SOC_DAPM_MUX_E("mux", SND_SOC_NOPM,
+					0, 0, NULL,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_aif_in]	= SND_SOC_DAPM_AIF_IN_E("aif_in", NULL, 0,
+					SND_SOC_NOPM, 0, 0,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_aif_out]	= SND_SOC_DAPM_AIF_OUT_E("aif_out", NULL, 0,
+					SND_SOC_NOPM, 0, 0,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+};
+
 static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
 				      struct snd_soc_dapm_widget *dw,
 				      struct gb_audio_widget *w, int *w_size)
@@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
 	strlcpy(temp_name, w->name, NAME_SIZE);
 	snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
 
+	if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
+		ret = -EINVAL;
+		goto error;
+	}
+	*dw = gbaudio_widgets[w->type];
+	dw->name = w->name;
+
 	switch (w->type) {
 	case snd_soc_dapm_spk:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_SPK(w->name, gbcodec_event_spk);
 		module->op_devices |= GBAUDIO_DEVICE_OUT_SPEAKER;
 		break;
 	case snd_soc_dapm_hp:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_HP(w->name, gbcodec_event_hp);
 		module->op_devices |= (GBAUDIO_DEVICE_OUT_WIRED_HEADSET
-					| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE);
+					| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE),
 		module->ip_devices |= GBAUDIO_DEVICE_IN_WIRED_HEADSET;
 		break;
 	case snd_soc_dapm_mic:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_MIC(w->name, gbcodec_event_int_mic);
 		module->ip_devices |= GBAUDIO_DEVICE_IN_BUILTIN_MIC;
 		break;
-	case snd_soc_dapm_output:
-		*dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_OUTPUT(w->name);
-		break;
-	case snd_soc_dapm_input:
-		*dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_INPUT(w->name);
-		break;
-	case snd_soc_dapm_switch:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_SWITCH_E(w->name, SND_SOC_NOPM, 0, 0,
-					      widget_kctls,
-					      gbaudio_widget_event,
-					      SND_SOC_DAPM_PRE_PMU |
-					      SND_SOC_DAPM_POST_PMD);
-		break;
-	case snd_soc_dapm_pga:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_PGA_E(w->name, SND_SOC_NOPM, 0, 0, NULL, 0,
-					   gbaudio_widget_event,
-					   SND_SOC_DAPM_PRE_PMU |
-					   SND_SOC_DAPM_POST_PMD);
-		break;
-	case snd_soc_dapm_mixer:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_MIXER_E(w->name, SND_SOC_NOPM, 0, 0, NULL,
-					     0, gbaudio_widget_event,
-					     SND_SOC_DAPM_PRE_PMU |
-					     SND_SOC_DAPM_POST_PMD);
-		break;
-	case snd_soc_dapm_mux:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_MUX_E(w->name, SND_SOC_NOPM, 0, 0,
-					   widget_kctls, gbaudio_widget_event,
-					   SND_SOC_DAPM_PRE_PMU |
-					   SND_SOC_DAPM_POST_PMD);
-		break;
 	case snd_soc_dapm_aif_in:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_AIF_IN_E(w->name, w->sname, 0,
-					      SND_SOC_NOPM,
-					      0, 0, gbaudio_widget_event,
-					      SND_SOC_DAPM_PRE_PMU |
-					      SND_SOC_DAPM_POST_PMD);
-		break;
 	case snd_soc_dapm_aif_out:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_AIF_OUT_E(w->name, w->sname, 0,
-					       SND_SOC_NOPM,
-					       0, 0, gbaudio_widget_event,
-					       SND_SOC_DAPM_PRE_PMU |
-					       SND_SOC_DAPM_POST_PMD);
-		break;
-	default:
-		ret = -EINVAL;
-		goto error;
+		dw->sname = w->sname;
 	}
 
 	dev_dbg(module->dev, "%s: widget of type %d created\n", dw->name,
-- 
2.29.2


^ permalink raw reply related	[flat|nested] 6+ messages in thread

* [PATCH] staging: greybus: fix stack size warning with UBSAN
@ 2021-01-03 22:35 ` Arnd Bergmann
  0 siblings, 0 replies; 6+ messages in thread
From: Arnd Bergmann @ 2021-01-03 22:35 UTC (permalink / raw)
  To: Vaibhav Agarwal, Mark Greer, Johan Hovold, Alex Elder,
	Greg Kroah-Hartman, Nathan Chancellor, Nick Desaulniers
  Cc: devel, Arnd Bergmann, clang-built-linux, linux-kernel, Coiby Xu,
	greybus-dev, Dan Carpenter

From: Arnd Bergmann <arnd@arndb.de>

clang warns about excessive stack usage in this driver when
UBSAN is enabled:

drivers/staging/greybus/audio_topology.c:977:12: error: stack frame size of 1836 bytes in function 'gbaudio_tplg_create_widget' [-Werror,-Wframe-larger-than=]

Rework this code to no longer use compound literals for
initializing the structure in each case, but instead keep
the common bits in a preallocated constant array and copy
them as needed.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/staging/greybus/audio_topology.c | 106 ++++++++++-------------
 1 file changed, 47 insertions(+), 59 deletions(-)

diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
index 96b8b29fe899..c03873915c20 100644
--- a/drivers/staging/greybus/audio_topology.c
+++ b/drivers/staging/greybus/audio_topology.c
@@ -974,6 +974,44 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w,
 	return ret;
 }
 
+static const struct snd_soc_dapm_widget gbaudio_widgets[] = {
+	[snd_soc_dapm_spk]	= SND_SOC_DAPM_SPK("spk", gbcodec_event_spk),
+	[snd_soc_dapm_hp]	= SND_SOC_DAPM_HP("hp", gbcodec_event_hp),
+	[snd_soc_dapm_mic]	= SND_SOC_DAPM_MIC("mic", gbcodec_event_int_mic),
+	[snd_soc_dapm_output]	= SND_SOC_DAPM_OUTPUT("output"),
+	[snd_soc_dapm_input]	= SND_SOC_DAPM_INPUT("input"),
+	[snd_soc_dapm_switch]	= SND_SOC_DAPM_SWITCH_E("switch", SND_SOC_NOPM,
+					0, 0, NULL,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_pga]	= SND_SOC_DAPM_PGA_E("pga", SND_SOC_NOPM,
+					0, 0, NULL, 0,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_mixer]	= SND_SOC_DAPM_MIXER_E("mixer", SND_SOC_NOPM,
+					0, 0, NULL, 0,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_mux]	= SND_SOC_DAPM_MUX_E("mux", SND_SOC_NOPM,
+					0, 0, NULL,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_aif_in]	= SND_SOC_DAPM_AIF_IN_E("aif_in", NULL, 0,
+					SND_SOC_NOPM, 0, 0,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+	[snd_soc_dapm_aif_out]	= SND_SOC_DAPM_AIF_OUT_E("aif_out", NULL, 0,
+					SND_SOC_NOPM, 0, 0,
+					gbaudio_widget_event,
+					SND_SOC_DAPM_PRE_PMU |
+					SND_SOC_DAPM_POST_PMD),
+};
+
 static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
 				      struct snd_soc_dapm_widget *dw,
 				      struct gb_audio_widget *w, int *w_size)
@@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
 	strlcpy(temp_name, w->name, NAME_SIZE);
 	snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
 
+	if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
+		ret = -EINVAL;
+		goto error;
+	}
+	*dw = gbaudio_widgets[w->type];
+	dw->name = w->name;
+
 	switch (w->type) {
 	case snd_soc_dapm_spk:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_SPK(w->name, gbcodec_event_spk);
 		module->op_devices |= GBAUDIO_DEVICE_OUT_SPEAKER;
 		break;
 	case snd_soc_dapm_hp:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_HP(w->name, gbcodec_event_hp);
 		module->op_devices |= (GBAUDIO_DEVICE_OUT_WIRED_HEADSET
-					| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE);
+					| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE),
 		module->ip_devices |= GBAUDIO_DEVICE_IN_WIRED_HEADSET;
 		break;
 	case snd_soc_dapm_mic:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_MIC(w->name, gbcodec_event_int_mic);
 		module->ip_devices |= GBAUDIO_DEVICE_IN_BUILTIN_MIC;
 		break;
-	case snd_soc_dapm_output:
-		*dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_OUTPUT(w->name);
-		break;
-	case snd_soc_dapm_input:
-		*dw = (struct snd_soc_dapm_widget)SND_SOC_DAPM_INPUT(w->name);
-		break;
-	case snd_soc_dapm_switch:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_SWITCH_E(w->name, SND_SOC_NOPM, 0, 0,
-					      widget_kctls,
-					      gbaudio_widget_event,
-					      SND_SOC_DAPM_PRE_PMU |
-					      SND_SOC_DAPM_POST_PMD);
-		break;
-	case snd_soc_dapm_pga:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_PGA_E(w->name, SND_SOC_NOPM, 0, 0, NULL, 0,
-					   gbaudio_widget_event,
-					   SND_SOC_DAPM_PRE_PMU |
-					   SND_SOC_DAPM_POST_PMD);
-		break;
-	case snd_soc_dapm_mixer:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_MIXER_E(w->name, SND_SOC_NOPM, 0, 0, NULL,
-					     0, gbaudio_widget_event,
-					     SND_SOC_DAPM_PRE_PMU |
-					     SND_SOC_DAPM_POST_PMD);
-		break;
-	case snd_soc_dapm_mux:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_MUX_E(w->name, SND_SOC_NOPM, 0, 0,
-					   widget_kctls, gbaudio_widget_event,
-					   SND_SOC_DAPM_PRE_PMU |
-					   SND_SOC_DAPM_POST_PMD);
-		break;
 	case snd_soc_dapm_aif_in:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_AIF_IN_E(w->name, w->sname, 0,
-					      SND_SOC_NOPM,
-					      0, 0, gbaudio_widget_event,
-					      SND_SOC_DAPM_PRE_PMU |
-					      SND_SOC_DAPM_POST_PMD);
-		break;
 	case snd_soc_dapm_aif_out:
-		*dw = (struct snd_soc_dapm_widget)
-			SND_SOC_DAPM_AIF_OUT_E(w->name, w->sname, 0,
-					       SND_SOC_NOPM,
-					       0, 0, gbaudio_widget_event,
-					       SND_SOC_DAPM_PRE_PMU |
-					       SND_SOC_DAPM_POST_PMD);
-		break;
-	default:
-		ret = -EINVAL;
-		goto error;
+		dw->sname = w->sname;
 	}
 
 	dev_dbg(module->dev, "%s: widget of type %d created\n", dw->name,
-- 
2.29.2

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^ permalink raw reply related	[flat|nested] 6+ messages in thread

* Re: [PATCH] staging: greybus: fix stack size warning with UBSAN
  2021-01-03 22:35 ` Arnd Bergmann
@ 2021-01-04  2:18   ` Alex Elder
  -1 siblings, 0 replies; 6+ messages in thread
From: Alex Elder @ 2021-01-04  2:18 UTC (permalink / raw)
  To: Arnd Bergmann, Vaibhav Agarwal, Mark Greer, Johan Hovold,
	Alex Elder, Greg Kroah-Hartman, Nathan Chancellor,
	Nick Desaulniers
  Cc: Arnd Bergmann, Dan Carpenter, Coiby Xu, greybus-dev, devel,
	linux-kernel, clang-built-linux

On 1/3/21 4:35 PM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> clang warns about excessive stack usage in this driver when
> UBSAN is enabled:
> 
> drivers/staging/greybus/audio_topology.c:977:12: error: stack frame size of 1836 bytes in function 'gbaudio_tplg_create_widget' [-Werror,-Wframe-larger-than=]
> 
> Rework this code to no longer use compound literals for
> initializing the structure in each case, but instead keep
> the common bits in a preallocated constant array and copy
> them as needed.

This is good, but I have a few comments.

You took out the default case, and it seems you are using
a w->type value bigger than the initialization array to
determine validity.  But there are more values defined in
the snd_soc_dapm_type enumerated type than are explicitly
listed as cases in the switch statement.  So the switch
statement no longer treats some types as invalid (such
as snd_soc_dapm_demux).  Am I missing something?

You are setting explicit names, such as "spk", "hp",
"mic", etc. in the initialization array.  But you
update the name after (struct) assigning from the
array.  I have no real objection I guess, but why
bother?  Why not just use null pointers in the
initialization array?

You change a semicolon to a comma in one spot, and you
should not have.  I'll point that out below.

I like that you got rid of the type casts, which were
apparently unnecessary.

You dropped the break in the final case in the switch
statement, but in an earlier discussion I think we
concluded that wasn't a problem.

I guess the main thing is the first thing mentioned.


Thanks.

					-Alex

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   drivers/staging/greybus/audio_topology.c | 106 ++++++++++-------------
>   1 file changed, 47 insertions(+), 59 deletions(-)
> 
> diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
> index 96b8b29fe899..c03873915c20 100644
> --- a/drivers/staging/greybus/audio_topology.c
> +++ b/drivers/staging/greybus/audio_topology.c
> @@ -974,6 +974,44 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w,
>   	return ret;
>   }
>   
> +static const struct snd_soc_dapm_widget gbaudio_widgets[] = {
> +	[snd_soc_dapm_spk]	= SND_SOC_DAPM_SPK("spk", gbcodec_event_spk),
> +	[snd_soc_dapm_hp]	= SND_SOC_DAPM_HP("hp", gbcodec_event_hp),
> +	[snd_soc_dapm_mic]	= SND_SOC_DAPM_MIC("mic", gbcodec_event_int_mic),

. . .

> @@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
>   	strlcpy(temp_name, w->name, NAME_SIZE);
>   	snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
>   
> +	if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
> +		ret = -EINVAL;
> +		goto error;
> +	}
> +	*dw = gbaudio_widgets[w->type];
> +	dw->name = w->name;
> +
>   	switch (w->type) {
>   	case snd_soc_dapm_spk:
> -		*dw = (struct snd_soc_dapm_widget)
> -			SND_SOC_DAPM_SPK(w->name, gbcodec_event_spk);
>   		module->op_devices |= GBAUDIO_DEVICE_OUT_SPEAKER;
>   		break;
>   	case snd_soc_dapm_hp:
> -		*dw = (struct snd_soc_dapm_widget)
> -			SND_SOC_DAPM_HP(w->name, gbcodec_event_hp);
>   		module->op_devices |= (GBAUDIO_DEVICE_OUT_WIRED_HEADSET
> -					| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE);
> +					| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE),

Please fix this (above) to preserve the original semicolon.

>   		module->ip_devices |= GBAUDIO_DEVICE_IN_WIRED_HEADSET;
>   		break;
>   	case snd_soc_dapm_mic:
> -		*dw = (struct snd_soc_dapm_widget)
> -			SND_SOC_DAPM_MIC(w->name, gbcodec_event_int_mic);
>   		module->ip_devices |= GBAUDIO_DEVICE_IN_BUILTIN_MIC;
>   		break;

. . .

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] staging: greybus: fix stack size warning with UBSAN
@ 2021-01-04  2:18   ` Alex Elder
  0 siblings, 0 replies; 6+ messages in thread
From: Alex Elder @ 2021-01-04  2:18 UTC (permalink / raw)
  To: Arnd Bergmann, Vaibhav Agarwal, Mark Greer, Johan Hovold,
	Alex Elder, Greg Kroah-Hartman, Nathan Chancellor,
	Nick Desaulniers
  Cc: devel, Arnd Bergmann, clang-built-linux, linux-kernel, Coiby Xu,
	greybus-dev, Dan Carpenter

On 1/3/21 4:35 PM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> clang warns about excessive stack usage in this driver when
> UBSAN is enabled:
> 
> drivers/staging/greybus/audio_topology.c:977:12: error: stack frame size of 1836 bytes in function 'gbaudio_tplg_create_widget' [-Werror,-Wframe-larger-than=]
> 
> Rework this code to no longer use compound literals for
> initializing the structure in each case, but instead keep
> the common bits in a preallocated constant array and copy
> them as needed.

This is good, but I have a few comments.

You took out the default case, and it seems you are using
a w->type value bigger than the initialization array to
determine validity.  But there are more values defined in
the snd_soc_dapm_type enumerated type than are explicitly
listed as cases in the switch statement.  So the switch
statement no longer treats some types as invalid (such
as snd_soc_dapm_demux).  Am I missing something?

You are setting explicit names, such as "spk", "hp",
"mic", etc. in the initialization array.  But you
update the name after (struct) assigning from the
array.  I have no real objection I guess, but why
bother?  Why not just use null pointers in the
initialization array?

You change a semicolon to a comma in one spot, and you
should not have.  I'll point that out below.

I like that you got rid of the type casts, which were
apparently unnecessary.

You dropped the break in the final case in the switch
statement, but in an earlier discussion I think we
concluded that wasn't a problem.

I guess the main thing is the first thing mentioned.


Thanks.

					-Alex

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   drivers/staging/greybus/audio_topology.c | 106 ++++++++++-------------
>   1 file changed, 47 insertions(+), 59 deletions(-)
> 
> diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
> index 96b8b29fe899..c03873915c20 100644
> --- a/drivers/staging/greybus/audio_topology.c
> +++ b/drivers/staging/greybus/audio_topology.c
> @@ -974,6 +974,44 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w,
>   	return ret;
>   }
>   
> +static const struct snd_soc_dapm_widget gbaudio_widgets[] = {
> +	[snd_soc_dapm_spk]	= SND_SOC_DAPM_SPK("spk", gbcodec_event_spk),
> +	[snd_soc_dapm_hp]	= SND_SOC_DAPM_HP("hp", gbcodec_event_hp),
> +	[snd_soc_dapm_mic]	= SND_SOC_DAPM_MIC("mic", gbcodec_event_int_mic),

. . .

> @@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
>   	strlcpy(temp_name, w->name, NAME_SIZE);
>   	snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
>   
> +	if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
> +		ret = -EINVAL;
> +		goto error;
> +	}
> +	*dw = gbaudio_widgets[w->type];
> +	dw->name = w->name;
> +
>   	switch (w->type) {
>   	case snd_soc_dapm_spk:
> -		*dw = (struct snd_soc_dapm_widget)
> -			SND_SOC_DAPM_SPK(w->name, gbcodec_event_spk);
>   		module->op_devices |= GBAUDIO_DEVICE_OUT_SPEAKER;
>   		break;
>   	case snd_soc_dapm_hp:
> -		*dw = (struct snd_soc_dapm_widget)
> -			SND_SOC_DAPM_HP(w->name, gbcodec_event_hp);
>   		module->op_devices |= (GBAUDIO_DEVICE_OUT_WIRED_HEADSET
> -					| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE);
> +					| GBAUDIO_DEVICE_OUT_WIRED_HEADPHONE),

Please fix this (above) to preserve the original semicolon.

>   		module->ip_devices |= GBAUDIO_DEVICE_IN_WIRED_HEADSET;
>   		break;
>   	case snd_soc_dapm_mic:
> -		*dw = (struct snd_soc_dapm_widget)
> -			SND_SOC_DAPM_MIC(w->name, gbcodec_event_int_mic);
>   		module->ip_devices |= GBAUDIO_DEVICE_IN_BUILTIN_MIC;
>   		break;

. . .
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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] staging: greybus: fix stack size warning with UBSAN
  2021-01-03 22:35 ` Arnd Bergmann
@ 2021-01-04  6:22   ` Dan Carpenter
  -1 siblings, 0 replies; 6+ messages in thread
From: Dan Carpenter @ 2021-01-04  6:22 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: Vaibhav Agarwal, Mark Greer, Johan Hovold, Alex Elder,
	Greg Kroah-Hartman, Nathan Chancellor, Nick Desaulniers,
	Arnd Bergmann, Coiby Xu, greybus-dev, devel, linux-kernel,
	clang-built-linux

On Sun, Jan 03, 2021 at 11:35:32PM +0100, Arnd Bergmann wrote:
> @@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
>  	strlcpy(temp_name, w->name, NAME_SIZE);
>  	snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
>  
> +	if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
                    ^^

Off by one.  >= here.


> +		ret = -EINVAL;
> +		goto error;
> +	}
> +	*dw = gbaudio_widgets[w->type];
> +	dw->name = w->name;

regards,
dan carpenter


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] staging: greybus: fix stack size warning with UBSAN
@ 2021-01-04  6:22   ` Dan Carpenter
  0 siblings, 0 replies; 6+ messages in thread
From: Dan Carpenter @ 2021-01-04  6:22 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: devel, Alex Elder, Arnd Bergmann, Vaibhav Agarwal,
	Greg Kroah-Hartman, Nick Desaulniers, Johan Hovold, Coiby Xu,
	Mark Greer, greybus-dev, clang-built-linux, Nathan Chancellor,
	linux-kernel

On Sun, Jan 03, 2021 at 11:35:32PM +0100, Arnd Bergmann wrote:
> @@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
>  	strlcpy(temp_name, w->name, NAME_SIZE);
>  	snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
>  
> +	if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
                    ^^

Off by one.  >= here.


> +		ret = -EINVAL;
> +		goto error;
> +	}
> +	*dw = gbaudio_widgets[w->type];
> +	dw->name = w->name;

regards,
dan carpenter

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2021-01-04  6:23 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-03 22:35 [PATCH] staging: greybus: fix stack size warning with UBSAN Arnd Bergmann
2021-01-03 22:35 ` Arnd Bergmann
2021-01-04  2:18 ` Alex Elder
2021-01-04  2:18   ` Alex Elder
2021-01-04  6:22 ` Dan Carpenter
2021-01-04  6:22   ` Dan Carpenter

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